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Question

Assertion :In acidic medium, K2Cr2O7 exists as Cr2O27 (orange) while in basic medium it is converted to CrO24(yellow). Reason: K2Cr2O7 is hygroscopic in nature and changes colour on reaction with water.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is correct but Reason is incorrect
In acidic medium :
Cr2O27(orange) +14 H+ 2Cr3+ (colourless) +7 H2O
In Basic Medium:
Cr2O27(orange) +2 OH 2CrO24(yellow) +H2O
So, change in color is due to formation of different ions in different mediums.

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